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8 USE CAS E 3 – GLOBAL RUNOFF
8.1 Contributors Role
Contributor
SOS Services KISTERS
SOS Client KISTERS
Data Provider GRDC
Data Provider USGS
Service Provider USGS
Table 2: Contributo rs for Use Case 3.
8.2 Introduction
T he original plan for this use ca se was to provide calc ulated monthly and yearly volum e dischar ge estimates from a few lar ge rivers dischar ging to the oceans. T his was an am bitious
plan in which processing tasks were to be include d as part of a workflow that would totalize the dischar ge mea surement for a selected year an d then display a ggre gated value s. Candidate
locations for the experiment were to be selected from the Global Runoff Data Center GRDC database.
T he plan was a djusted durin g the experiment as a result of t he slower than expected progress due to the difficulties with developing services conc urrently with the WaterML2.0
development. T he original plan for this use case can be seen in Appendix 2.
8.3 Moti vation and Goals
The goal of the use case was adjusted to two tasks: 1 to make data from the GTN-R Station network provided by Global Runoff Data
Center available using WaterML2 and SOS and 2 to enable the GRDC to ingest data from the USGS Mississippi Area using
WaterML2 and SOS.
8.4 Design and Implementation
The implementation was based on establishing an instance of the KISTERS WISKIKiTSM to provide the underlying data repository for the GRDC data. This was
setup by KISTERS within the KISTERS DMZ for the purpose of the experiment.
The GRDC data was migrated into this data management system but required some modification to support delivery by WaterML2.0. The data was extended to include
gauge name, WMO gauge identifier, country the gauge is in, time zone information and spatial references as well as the WMO catchment name and associated size.
On top of the WISKIKiTSM s ystem the KISTERS Interoperability Solution KiWIS provided the support for SOSWaterML2.0
http:kiwis.kisters.de .
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The WISKI Desktop application was also extended to consume metadata and time series data through new SOS consumer classes. For this use case, a dedicated consumer
class has been developed to ingest data from the USGS NWIS Services which can be found at
http:nwisvaws02.er.usgs.govogc-swie .
The diagram below shows the architecture of the system for use case 3.
Figure 2 : Architecture of the system for use case 3
8.5 USGS SOS Services
The experimental WaterML 2.0 service created by the United States Geological Survey USGS provided runoff data from the Mississippi to GRDC. USGS had an additional
goal to evaluate how feasible it would be to serve hydrological time series data from the entire United States using WaterML 2.0.
This service was built to deliver WaterML 2.0 using initially SOS1.0 as required by SWIE. It was able to offer a GetCapabilities, DescribeSensor, GetDataAvailablity, and
GetObservation output for all of the real-time water data that is available in the USGS National Water Information System NWIS, as well as historic daily data. Discharge,
gage height, temperature, precipitation, dissolved oxygen, turbidity, and pH were the properties that were specifically tested, although all properties are available using a 5-
digit parameter code. A very elementary WebFeatureService wfs was also provided. GetObservation data using WaterML 2.0 was the main output being investigated. The
service is available here:
http:nwisvaws02.er.usgs.govogc-swie . It will continue to
evolve with the changing WaterML 2.0 requirements.
8.6 USGS SOS Service Results
